Defensive publication



DEFENSIVE PUBLICATION UNITED STATES PATENT OFFICE Published at therequest of the applicant or owner in accordance with the Notice of Dec.16, 1969, 869 0.G. 687. The abstracts of Defensive Publicationapplications are identified by distinctly numbered series and arearranged chronologically. The heading of each abstract indicates thenumber of pages of specification, including claims and sheets ofdrawings contained in the application as originally filed. The files ofthese applications are available to the public for inspection andreproduction may be purchased for 30 cents a sheet.

Defensive Publication applications have not been examined as to themerits of alleged invention. The Patent Oflice makes no assertion as tothe novelty of the disclosed subject matter.

PUBLISHED SEPTEMBER 8, 1970 T878,010 USE OF ORGANIC ACIDS AND ACIDDERIVA- TIVES AS ANTIFOGGANTS IN SILVER HALIDE EMULSIONS Dorothy J.Beavers, Eastman Kodak C0., Kodak Park Works, Rochester, N.Y. 14650Filed Mar. 9, 1970, Ser. No. 17,879 Int. Cl. G03c 1/34 US. Cl. 96-109 NoDrawing. 35 Pages Specification Organic acids and acid derivatives areeffective antifoggants for silver halide photographic emulsions.Examples indicate that a higher degree of antifoggant capability resultsfrom the use of these compounds than would be expected from the loweringof the pH of the emulsion resulting from such compounds. Effectiveantifoggants include organic acids, anhydrides, imides, esters, andpolymers thereof, containing free carboxy, sulfonic, or phosphategroups, or groups which will cleave to form free carboxy, sulfonic, orphosphate groups. Specific examples found elfective include benzoicacid, 3,4,5-trimethoxycinnamic acid, 1 bromo-3,3 dimethylcyclobutanecarboxylic acid, quinic acid, octric acid, homoisophthalic acid, maleicanhydride, N hydroxysuccinimide, N hydroxyphthalimide,3-sulfolamylsulfonic acid, ammonium salt; mono-n-octadecylphosphate,3,4-epoxysulfolane, hydroxyhydroquinone triacetate, andcopoly(methacrylate; acrylic acid) (10:90 ratio).

